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MAT

Plastic Oil/Grease Cap – For 12K–15K Hubs | MT
SKU: 1215-GO-CPMAT
$28.00 USD $28.00 USD $35.00 USD
Sale 20.0% $7.00 USD (20.0%)
Shipping calculated at checkout.
In stock
Description

This heavy-duty plastic oil/grease cap is designed for high-capacity trailer axles ranging from 12,000 to 15,000 lbs. Featuring a 4" threaded outer diameter and 12 threads per inch, this cap delivers secure sealing performance in oil bath hub systems. Ideal for Dexter 10K HD to 15K axles, this cap includes an O-ring and rubber plug for a complete installation.

Detailed Information:
Thread Diameter 4"
Thread Count 12 TPI
Material Plastic
Axle Rating 12,000–15,000 lbs (Also fits 10K HD)
Fitting:

Designed for use with Dexter 10K HD to 15K oil bath axle hubs. Replaces Dexter oil cap part #21-36. Not compatible with Dexter 10K General Duty axles manufactured in 2009 or later (part #21-88).

Features:
  • Complete Solution: Includes oil cap, rubber plug, and O-ring for a full replacement.
  • Heavy-Duty Compatibility: Supports high-load axles in industrial and commercial trailer applications.
  • Secure Fit: Threaded design provides reliable sealing and helps retain lubrication.
  • Durable Construction: Made from impact- and oil-resistant plastic for long service life.
Interchangeable Part Numbers:
  • OC-86510-16-LOTOF2
  • OC-86510-16
  • 21-36
  • K71-148-00
Product Overview:

This 4" threaded plastic oil/grease cap is a critical component for maintaining proper lubrication in 12K–15K trailer hubs. Designed for Dexter HD axle systems, it ensures effective sealing and ease of service with its included plug and O-ring. A reliable replacement solution for demanding towing and transport environments.

We want you to be completely satisfied with your purchase. That’s why we offer a hassle-free return policy within 30 days of delivery*. If your item is unused, in original packaging, and eligible for return, you can send it back for a refund or exchange.

*Some exclusions may apply

Some of our products are backed by a 1-year limited manufacturer warranty covering defects in materials and workmanship under normal use. If you experience any issues during this period, we’ll work with you to repair, replace, or resolve it according to warranty terms.*

*Proof of purchase required

Need it fast? We’ve got you covered. Orders confirmed before 3 PM Eastern Standard Time (Monday–Friday) are processed and shipped out the same business day. Orders placed after the cutoff will ship the next business day.
Plastic Oil/Grease Cap – For 12K–15K Hubs | MT

Customer Reviews

Based on 12 reviews
83%
(10)
17%
(2)
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H
Hendrik Hogsden
Solid Construction and Fit

Thick plastic, clean molding, and a tight rubber plug. The cap doesn’t rattle or loosen from vibration. Looks OEM and performs like it. Great value for a critical seal.

H
Hew Gaskall
Durable and Oil-Resistant

After three months of daily use, it hasn’t cracked or become brittle. Resists UV and road grime. The rubber plug stays flexible—no hardening or leaking.

J
Julie Dellenbrok
Verified Fit for 10K HD Axles

Important note: fits 10K HD but not standard 10K after 2009. Double-checked my axle model—this was the right one. Sealed perfectly and matches the other side.

M
Mohammed Breawood
Slight Thread Resistance at First

Took a little hand pressure to start—probably due to new thread molding. Once seated, it turned smoothly. No stripping or binding. Seals better than the old one.

G
Gael De Filippis
Reliable and Consistently Made

Bought two—one for each side. Both identical in fit and finish. No warping or off-center threads. Confident it’ll last as long as the original.

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